vLLM KV Block kv_cache_interface.py has_mamba_layers uninitialized resource

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-7141
StatePUBLISHED
AssignerVulDB
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-27 17:16:45 UTC
Updated2026-08-25 20:17:08 UTC
DescriptionA vulnerability was found in vLLM up to 0.19.0. The affected element is the function has_mamba_layers of the file vllm/v1/kv_cache_interface.py of the component KV Block Handler. Performing a manipulation results in uninitialized resource. It is possible to initiate the attack remotely. The attack is considered to have high complexity. The exploitability is described as difficult. The exploit has been made public and could be used. The existence of this vulnerability is still disputed at present. The proposed patch did not fix the issue. A 3rd party explains: "The divergence could be explained by a benign and expected vLLM behavior where vLLM server could group concurrent requests together resulting in different input shapes based on varying request arrival time. The differences in grouped input shapes could call different kernels with could produce difference results due to rounding and differences in order of operations. There is an environment variable VLLM_BATCH_INVARIANT=1 for users that desire to have deterministic output with temperature 0.0."

Risk And Classification

Primary CVSS: v4.0 2.9 LOW from [email protected]

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.002890000 probability, percentile 0.208160000 (date 2026-08-25)

Problem Types: CWE-908 | CWE-908 Uninitialized Resource

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary2.9LOWCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/C...
4.0CNADECLARED6.3MEDIUMCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
3.1[email protected]Secondary5.6MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
3.1CNADECLARED5.6MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:U/RC:R
3.0CNADECLARED5.6MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:U/RC:R
2.0[email protected]Secondary5.1AV:N/AC:H/Au:N/C:P/I:P/A:P
2.0CNADECLARED5.1AV:N/AC:H/Au:N/C:P/I:P/A:P/E:POC/RL:U/RC:UR

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:U/RC:R

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Vllm Vllm All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na VLLM affected 0.1 Not specified
CNA Na VLLM affected 0.2 Not specified
CNA Na VLLM affected 0.3 Not specified
CNA Na VLLM affected 0.4 Not specified
CNA Na VLLM affected 0.5 Not specified
CNA Na VLLM affected 0.6 Not specified
CNA Na VLLM affected 0.7 Not specified
CNA Na VLLM affected 0.8 Not specified
CNA Na VLLM affected 0.9 Not specified
CNA Na VLLM affected 0.10 Not specified
CNA Na VLLM affected 0.11 Not specified
CNA Na VLLM affected 0.12 Not specified
CNA Na VLLM affected 0.13 Not specified
CNA Na VLLM affected 0.14 Not specified
CNA Na VLLM affected 0.15 Not specified
CNA Na VLLM affected 0.16 Not specified
CNA Na VLLM affected 0.17 Not specified
CNA Na VLLM affected 0.18 Not specified
CNA Na VLLM affected 0.19.0 Not specified

References

ReferenceSourceLinkTags
github.com/vllm-project/vllm/issues/39146 [email protected] github.com Issue Tracking
vuldb.com/cve/CVE-2026-7141 [email protected] vuldb.com
vuldb.com/vuln/359740 [email protected] vuldb.com Third Party Advisory, VDB Entry
github.com/vllm-project/vllm/issues/39146 [email protected] github.com Issue Tracking
vuldb.com/vuln/359740/cti [email protected] vuldb.com Permissions Required
vuldb.com/submit/801297 [email protected] vuldb.com Third Party Advisory, VDB Entry
github.com/AjAnubolu/vllm/commit/1ad67864c0c20f167929e64c875f5c28e1aad9fd MITRE github.com
github.com/vllm-project/vllm/pull/39283 MITRE github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Zyz3366 (VulDB User) (en)

CNA: VulDB CNA Team (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-04-26T00:00:00.000ZAdvisory disclosed
CNA2026-04-26T02:00:00.000ZVulDB entry created
CNA2026-08-25T21:12:08.000ZVulDB entry last update

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